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In page Dahomey Gap:

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Evidence from biogeography suggests that the Dahomey Gap has had significance for up to 90 million years. Murphy and Collier, in their analysis of the Aplocheiloid fishes show a split in the African species which they attribute to the presence of an epicontinental sea between the late Cenomanian and early Eocene. [1] This discontinuity had earlier been noted in plant species by White[2] and is supported by an analysis of the Coffea clade by Maurin et al.[3]